From dabc8fbdb2e159d27b5f02ac428fa5788c2c4c2a Mon Sep 17 00:00:00 2001
From: Dom Cobley <popcornmix@gmail.com>
Date: Mon, 14 Mar 2022 17:56:10 +0000
Subject: [PATCH] vc4/drm: vc4_plane: Keep fractional source coords
 inside state

Signed-off-by: Dom Cobley <popcornmix@gmail.com>
---
 drivers/gpu/drm/vc4/vc4_drv.h   |  2 +-
 drivers/gpu/drm/vc4/vc4_plane.c | 68 ++++++++++++++++-----------------
 2 files changed, 34 insertions(+), 36 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -384,7 +384,7 @@ struct vc4_plane_state {
 
 	/* Clipped coordinates of the plane on the display. */
 	int crtc_x, crtc_y, crtc_w, crtc_h;
-	/* Clipped area being scanned from in the FB. */
+	/* Clipped area being scanned from in the FB in u16.16 format */
 	u32 src_x, src_y;
 
 	u32 src_w[2], src_h[2];
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -183,9 +183,9 @@ static const struct hvs_format *vc4_get_
 
 static enum vc4_scaling_mode vc4_get_scaling_mode(u32 src, u32 dst)
 {
-	if (dst == src)
+	if (dst == src >> 16)
 		return VC4_SCALING_NONE;
-	if (3 * dst >= 2 * src)
+	if (3 * dst >= 2 * (src >> 16))
 		return VC4_SCALING_PPF;
 	else
 		return VC4_SCALING_TPZ;
@@ -394,15 +394,10 @@ static int vc4_plane_setup_clipping_and_
 		vc4_state->offsets[i] = bo->dma_addr + fb->offsets[i];
 	}
 
-	/*
-	 * We don't support subpixel source positioning for scaling,
-	 * but fractional coordinates can be generated by clipping
-	 * so just round for now
-	 */
-	vc4_state->src_x = DIV_ROUND_CLOSEST(state->src.x1, 1 << 16);
-	vc4_state->src_y = DIV_ROUND_CLOSEST(state->src.y1, 1 << 16);
-	vc4_state->src_w[0] = DIV_ROUND_CLOSEST(state->src.x2, 1 << 16) - vc4_state->src_x;
-	vc4_state->src_h[0] = DIV_ROUND_CLOSEST(state->src.y2, 1 << 16) - vc4_state->src_y;
+	vc4_state->src_x = state->src.x1;
+	vc4_state->src_y = state->src.y1;
+	vc4_state->src_w[0] = state->src.x2 - vc4_state->src_x;
+	vc4_state->src_h[0] = state->src.y2 - vc4_state->src_y;
 
 	vc4_state->crtc_x = state->dst.x1;
 	vc4_state->crtc_y = state->dst.y1;
@@ -455,7 +450,7 @@ static void vc4_write_tpz(struct vc4_pla
 {
 	u32 scale, recip;
 
-	scale = (1 << 16) * src / dst;
+	scale = src / dst;
 
 	/* The specs note that while the reciprocal would be defined
 	 * as (1<<32)/scale, ~0 is close enough.
@@ -501,7 +496,7 @@ static u32 vc4_lbm_size(struct drm_plane
 	if (vc4_state->x_scaling[0] == VC4_SCALING_TPZ)
 		pix_per_line = vc4_state->crtc_w;
 	else
-		pix_per_line = vc4_state->src_w[0];
+		pix_per_line = vc4_state->src_w[0] >> 16;
 
 	if (!vc4_state->is_yuv) {
 		if (vc4_state->y_scaling[0] == VC4_SCALING_TPZ)
@@ -592,7 +587,8 @@ static void vc4_plane_calc_load(struct d
 	for (i = 0; i < fb->format->num_planes; i++) {
 		/* Even if the bandwidth/plane required for a single frame is
 		 *
-		 * vc4_state->src_w[i] * vc4_state->src_h[i] * cpp * vrefresh
+		 * (vc4_state->src_w[i] >> 16) * (vc4_state->src_h[i] >> 16) *
+		 *  cpp * vrefresh
 		 *
 		 * when downscaling, we have to read more pixels per line in
 		 * the time frame reserved for a single line, so the bandwidth
@@ -601,11 +597,11 @@ static void vc4_plane_calc_load(struct d
 		 * load by this number. We're likely over-estimating the read
 		 * demand, but that's better than under-estimating it.
 		 */
-		vscale_factor = DIV_ROUND_UP(vc4_state->src_h[i],
+		vscale_factor = DIV_ROUND_UP(vc4_state->src_h[i] >> 16,
 					     vc4_state->crtc_h);
-		vc4_state->membus_load += vc4_state->src_w[i] *
-					  vc4_state->src_h[i] * vscale_factor *
-					  fb->format->cpp[i];
+		vc4_state->membus_load += (vc4_state->src_w[i] >> 16) *
+					  (vc4_state->src_h[i] >> 16) *
+					  vscale_factor * fb->format->cpp[i];
 		vc4_state->hvs_load += vc4_state->crtc_h * vc4_state->crtc_w;
 	}
 
@@ -758,7 +754,8 @@ static int vc4_plane_mode_set(struct drm
 	bool mix_plane_alpha;
 	bool covers_screen;
 	u32 scl0, scl1, pitch0;
-	u32 tiling, src_y;
+	u32 tiling, src_x, src_y;
+	u32 width, height;
 	u32 hvs_format = format->hvs;
 	unsigned int rotation;
 	int ret, i;
@@ -770,6 +767,9 @@ static int vc4_plane_mode_set(struct drm
 	if (ret)
 		return ret;
 
+	width = vc4_state->src_w[0] >> 16;
+	height = vc4_state->src_h[0] >> 16;
+
 	/* SCL1 is used for Cb/Cr scaling of planar formats.  For RGB
 	 * and 4:4:4, scl1 should be set to scl0 so both channels of
 	 * the scaler do the same thing.  For YUV, the Y plane needs
@@ -790,9 +790,11 @@ static int vc4_plane_mode_set(struct drm
 					 DRM_MODE_REFLECT_Y);
 
 	/* We must point to the last line when Y reflection is enabled. */
-	src_y = vc4_state->src_y;
+	src_y = vc4_state->src_y >> 16;
 	if (rotation & DRM_MODE_REFLECT_Y)
-		src_y += vc4_state->src_h[0] - 1;
+		src_y += height - 1;
+
+	src_x = vc4_state->src_x >> 16;
 
 	switch (base_format_mod) {
 	case DRM_FORMAT_MOD_LINEAR:
@@ -807,7 +809,7 @@ static int vc4_plane_mode_set(struct drm
 						 (i ? v_subsample : 1) *
 						 fb->pitches[i];
 
-			vc4_state->offsets[i] += vc4_state->src_x /
+			vc4_state->offsets[i] += src_x /
 						 (i ? h_subsample : 1) *
 						 fb->format->cpp[i];
 		}
@@ -830,7 +832,7 @@ static int vc4_plane_mode_set(struct drm
 		 *	pitch * tile_h == tile_size * tiles_per_row
 		 */
 		u32 tiles_w = fb->pitches[0] >> (tile_size_shift - tile_h_shift);
-		u32 tiles_l = vc4_state->src_x >> tile_w_shift;
+		u32 tiles_l = src_x >> tile_w_shift;
 		u32 tiles_r = tiles_w - tiles_l;
 		u32 tiles_t = src_y >> tile_h_shift;
 		/* Intra-tile offsets, which modify the base address (the
@@ -840,7 +842,7 @@ static int vc4_plane_mode_set(struct drm
 		u32 tile_y = (src_y >> 4) & 1;
 		u32 subtile_y = (src_y >> 2) & 3;
 		u32 utile_y = src_y & 3;
-		u32 x_off = vc4_state->src_x & tile_w_mask;
+		u32 x_off = src_x & tile_w_mask;
 		u32 y_off = src_y & tile_h_mask;
 
 		/* When Y reflection is requested we must set the
@@ -936,7 +938,7 @@ static int vc4_plane_mode_set(struct drm
 				 * of the 12-pixels in that 128-bit word is the
 				 * first pixel to be used
 				 */
-				u32 remaining_pixels = vc4_state->src_x % 96;
+				u32 remaining_pixels = src_x % 96;
 				u32 aligned = remaining_pixels / 12;
 				u32 last_bits = remaining_pixels % 12;
 
@@ -958,12 +960,12 @@ static int vc4_plane_mode_set(struct drm
 					return -EINVAL;
 				}
 				pix_per_tile = tile_w / fb->format->cpp[0];
-				x_off = (vc4_state->src_x % pix_per_tile) /
+				x_off = (src_x % pix_per_tile) /
 					(i ? h_subsample : 1) *
 					fb->format->cpp[i];
 			}
 
-			tile = vc4_state->src_x / pix_per_tile;
+			tile = src_x / pix_per_tile;
 
 			vc4_state->offsets[i] += param * tile_w * tile;
 			vc4_state->offsets[i] += src_y /
@@ -1024,10 +1026,8 @@ static int vc4_plane_mode_set(struct drm
 		vc4_dlist_write(vc4_state,
 				(mix_plane_alpha ? SCALER_POS2_ALPHA_MIX : 0) |
 				vc4_hvs4_get_alpha_blend_mode(state) |
-				VC4_SET_FIELD(vc4_state->src_w[0],
-					      SCALER_POS2_WIDTH) |
-				VC4_SET_FIELD(vc4_state->src_h[0],
-					      SCALER_POS2_HEIGHT));
+				VC4_SET_FIELD(width, SCALER_POS2_WIDTH) |
+				VC4_SET_FIELD(height, SCALER_POS2_HEIGHT));
 
 		/* Position Word 3: Context.  Written by the HVS. */
 		vc4_dlist_write(vc4_state, 0xc0c0c0c0);
@@ -1085,10 +1085,8 @@ static int vc4_plane_mode_set(struct drm
 		/* Position Word 2: Source Image Size */
 		vc4_state->pos2_offset = vc4_state->dlist_count;
 		vc4_dlist_write(vc4_state,
-				VC4_SET_FIELD(vc4_state->src_w[0],
-					      SCALER5_POS2_WIDTH) |
-				VC4_SET_FIELD(vc4_state->src_h[0],
-					      SCALER5_POS2_HEIGHT));
+				VC4_SET_FIELD(width, SCALER5_POS2_WIDTH) |
+				VC4_SET_FIELD(height, SCALER5_POS2_HEIGHT));
 
 		/* Position Word 3: Context.  Written by the HVS. */
 		vc4_dlist_write(vc4_state, 0xc0c0c0c0);
